Modeling the supercritical desorption of orange essential oil from a silica-gel bed

Abstract

One of the most important byproducts of the orange juice industry is the oil phase. This is a mixture of terpenes, alcohols, and aldehydes, dissolved in approximately 96% limonene. To satisfactorily use oil phase as an ingredient in the food and cosmetics industries separation of the limonene is required. One possibility is to use a fixed bed of silica gel to remove the light or aroma compounds from the limonene. The aroma substances are then extracted from the bed of silica gel using supercritical carbon dioxide. This work deals with the modeling of the desorption step of the process using mass balance equations coupled with the Langmuir equilibrium isotherm. Data taken from the literature for the overall extraction curves were used together with empirical correlations to calculate the concentration profile of solute in the supercritical phase at the bed outlet. The system of equations was solved by the finite volume technique. The overall extraction curves calculated were in good agreement with the experimental ones

MODELING OF SPEARMINT OIL EXTRACTION IN A PACKED BED USING SC-CO2

“…Shrinking core model (Goto et al, 1996;King and Catchpole, 1993) b. Model based on heat transfer analogy (Papamichail et al, 2000) Spearmint Oil Extraction in a Packed Bed 301 c. Model based on mass transfer balance (Bulley et al, 1984;Fattori et al, 1988;Goodarznia and Eikani, 1998;Kim and Hong, 2002;Lee et al, 1986;Silva et al, 2000;Sovova, 2005;Sovova et al, 1994). Naik et al (1989) employed an empirical equation in terms of a Langmuir gas adsorption isotherm, while Nguyen et al (1991) treated SFE as a chemical reaction.…”

Supercritical technology in Brazil: system investigated (1994–2003)

“…The sources of the reference data classified as discussed above were: analytical methods [6-9,34-38, ; extraction [2,[4][5][10][11]18,19,21,22,[24][25][26][27][28][29][31][32][33][39][40][41]45,50,52,53,55,[57][58][59]61,62,66,; thermodynamics and fundamental studies [3,[12][13][14][15][16][17]20,23,30,[42][43][44][46][47][48][49]51,54,56,60,[63][64][166][167][168]…”

Obtenção por extração supercritica do extrato de funcho (Foeniculum vulgare)

“…O processo de SFE pode ser descrito através de um balanço diferencial de massa aplicada sobre o leito [FRANÇA et al, 1999;SILVA et al, 2000]. Em geral, para leitos cilíndricos, a relação entre o diâmetro do leito e o diâmetro das partículas é tal que, predominam os efeitos da transferência de massa axial.…”